JPH1044371A - Squeegee mechanism for screen printing and squeegee method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively and satisfactorily screen print even by a simple constitution and procedure if a step of a board to be printed is relatively large by rotatably providing a squeegee to a squeegee holding shaft perpendicular to its moving direction, and providing a driving means for rotating the squeegee. SOLUTION: A reciprocatingly moving mechanism 8 for holding a screen 5 on a placing table 3 for placing a board (w) to be screen printed by a holding member 5a to reciprocatingly move a frame member 6 and a squeegee 7 is provided. Further, an oblique angle altering mechanism for altering the squeegee 7 to a predetermined print oblique angle in response to its moving direction, a vertically moving mechanism for lowering and raising the squeegee 7 in a predetermined range on the way of moving, a lateral position altering mechanism 11 for altering a lateral position of the squeegee 7 in response to a moving direction, and a general controller are provided. Thus, the oblique angle of the squeegee can be set optimally at the time of forward printing and reverse printing, and a pressing force for maintaining the oblique angle can be set optimally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention aims at improving the efficiency of squeezing in screen printing in which a screen is arranged on a work substrate and ink on the screen is passed through the screen with a squeegee to fill the work substrate. The present invention relates to a squeegee mechanism and a squeegee method.

[0002]

2. Description of the Related Art In general, in various electronic devices such as home electric appliances and electronic office equipment, a main electronic circuit is formed by mounting an active element such as an IC chip on a printed circuit board on which a predetermined circuit pattern is formed. It is provided in the structure equipped with.

[0003] Printed circuit boards are often formed by screen printing.

[0004] That is, conventionally, there is known a screen printing method in which a screen is arranged on a work substrate and ink on the screen is passed through the screen with a squeegee to fill the work substrate. This screen printing method is a method of transferring a predetermined screen pattern onto a green sheet or a sintered ceramic plate using ink, and is used for forming circuit wiring on an IC substrate, electrodes such as capacitors and piezoelectrics, and functional elements. It is heavily used.

[0005] A conventional screen printing machine is configured as shown in FIG. The screen printing machine 50 includes a mounting table 51 on which a substrate w on which a predetermined circuit pattern is formed, and a mounting table 51 disposed directly above the mounting table 51, on which ink i is mounted in advance and a printing pattern is formed. Screen 52, a scraper 53 that spreads the ink i on the screen 52 uniformly (ink coating), and presses the uniformed ink i toward the substrate to pass through the print pattern of the screen 52. A squeegee 54 for printing on the substrate w, holding the scraper 53 and the squeegee 54,
A drive mechanism (not shown) for performing the ink i-coating operation using the scraper 53 and performing the printing operation using the squeegee 54 is also included.

The mounting table 51 is made of a thick steel material and is formed in a substantially square shape having a larger area than the substrate on which it is mounted. The mounting table 51 has a high rigidity so that the substrate can be stably mounted. ing. The mounting table 51 is held horizontally by a driving mechanism (not shown). The driving mechanism fixes the mounting table 51 at the printing position while maintaining the horizontal posture, and supplies and discharges the substrate. It is configured to be vertically and horizontally movable to a position.

The screen 52 is disposed at a predetermined gap distance above a substrate mounted on the mounting table 51 at a printing position, and is held by a holding member behind a front end in a printing movement direction. The ends are held so as to be exchangeable, so that the portion pressed by the squeegee 54 can contact the substrate during the printing operation. And this screen 5
2, a printed pattern is positioned and provided corresponding to a circuit pattern or the like of the substrate. Further, the print pattern of the screen 52 is formed by performing a process of passing the ink i through a corresponding portion of the screen 52.

The screen 52 is made of a predetermined synthetic fiber material. The synthetic fiber material penetrates the ink i placed on the screen 52, but is not pushed out from the lower surface unless pressed by a squeegee 54 or the like. Has the property of being able to hold ink i.

Further, the scraper 53 is formed in a long plate shape having a predetermined rigidity by using a metal plate having a predetermined rigidity as a raw material and having a predetermined thickness longer than at least the width of the substrate. And is movably held in the horizontal direction.

That is, the drive mechanism holds the upper base end of the scraper 53 in the direction perpendicular to the longitudinal direction of the substrate mounted on the mounting table 51, and The tip side is provided so as to be horizontal.

In addition, when the ink coating operation is performed by the drive mechanism described below, the drive mechanism is fixedly attached to the drive mechanism so as to incline at a predetermined angle rearward with respect to the movement direction. Therefore, during such an ink coating operation, the scraper 53
Since the posture is inclined backward with respect to the moving direction, the ink i on the screen 52 can be moved so as to be scooped up, and the ink i can be evenly spread on the screen 52.

The squeegee 54 is formed of a synthetic rubber having a predetermined elastic strength as a material, and is formed in a long plate shape having a predetermined thickness longer than at least the width of the substrate. It is held movably in the vertical and horizontal directions by a drive mechanism.

That is, like the scraper 53, the squeegee 54 has its longitudinal direction
The drive mechanism holds the upper base end in a direction perpendicular to the longitudinal direction of the substrate placed thereon, and the lower end is provided horizontally.

In a printing operation in which the drive mechanism moves down by a drive mechanism described later, the drive mechanism is fixedly attached to the drive mechanism so as to incline to a predetermined front side with respect to the movement direction. Therefore, during such a printing operation, the squeegee 54 is in a posture inclined forward with respect to the moving direction, so that the ink i on the screen 52 can be moved by pressing it toward the substrate, and the screen 52 can be moved. The ink i can be moved uniformly and reliably on the substrate by passing the print pattern.

The scraper 53 and the squeegee 5
The driving mechanism for driving the motor 4 to a predetermined range includes a moving mechanism for reciprocating the two at the same time and a vertical moving mechanism for individually moving the two up and down.

That is, this moving mechanism uses a motor or the like as a driving source, and at least has a scraper at a predetermined moving speed longer than at least the length of the substrate along the longitudinal direction of the substrate mounted on the mounting table 51. The squeegee 53 and the squeegee 54 are configured to reciprocate.

The vertical movement mechanism interlocks with the reciprocating movement of the movement mechanism, and the scraper 53 and the squeegee 54
, Two vertically moving mechanisms for individually and downwardly moving at predetermined moving points.

That is, when moving up and down by the moving mechanism, the up-and-down mechanism moves the scraper 53 to the screen 52 just before the ink i remaining near the substrate on the screen 52 at the end of the previous printing. Lower to the extent of contact, hold the squeegee 54 upward,
Immediately after passing the substrate, the scraper 53 is raised. Therefore, the ink coating process by the scraper 53 is performed as described above, and the surplus ink i by the coating process is left near the substrate.

When the moving mechanism moves backward, the vertical moving mechanism moves the squeegee 54 through the screen 52 in front of the ink i remaining near the substrate on the screen 52 due to the immediately preceding forward movement. The scraper 53 is lowered so as to contact the substrate with a predetermined pressing force to hold the scraper 53 upward and raise the squeegee 54 immediately after passing the substrate. Therefore, the printing process using the squeegee 54 is performed as described above, and the ink i collected by the printing process is left near the substrate.

The screen 52 printing machine constructed as described above performs the ink coating operation using the scraper 53 at the time of the outward movement by the drive mechanism, and performs the printing operation processing using the squeegee 54 at the time of the backward movement. Thus, a single screen printing is performed.

That is, during the forward movement, the screen 5
2, the scraper 53 is lowered to such an extent that it does not touch the substrate through the screen 52,
The movement of the scraper 53 causes the ink i to spread evenly on the screen 52.

When the ink i is spread uniformly on the screen 52 by the squeegee 54 in the backward movement, the ink i is pressed in the direction of the substrate, passes through the print pattern surface of the screen 52, and is applied to the substrate. ing. That is, the squeegee 54 is lowered to the extent that it comes into contact with the substrate via the screen 52 with an appropriate pressing force, and moves backward.

[0023]

However, in the conventional screen printing method, a step having a relatively large step (70 μm) due to a circuit pattern or the like provided on a printed surface of a substrate is used.
Above), there was a problem that printing was inferior.

That is, since printing is always performed by a one-way printing operation using a squeegee, the ink filling property of the portion on the rear side of the step with respect to this printing movement direction is extremely poor.

Therefore, a method of rotating the printed substrate once by 180 ° in a horizontal plane and performing the second printing is also conceivable. However, it is troublesome when the printing is performed manually, and is difficult when the printing is performed automatically. There is an inconvenience that the mechanism and the like become complicated and the reliability of the device is reduced. Further, in both cases, the correspondence between the printed pattern on the screen and the printed surface on the substrate cannot be completely the same, so that the print quality is reduced. Furthermore, since there are many work procedures in terms of production efficiency,
There was an inconvenience of being low.

The present invention has been made in view of the above-mentioned problems, and a simple structure and procedure enable reliable and good screen printing even when a step existing on a substrate to be printed is relatively large. It is an object to provide a squeegee mechanism and a squeegee method in possible screen printing.

[0027]

According to the first aspect of the present invention, a screen is arranged on a work substrate, and the ink on the screen is passed through the screen with a squeegee to fill the work substrate. In the screen printing, the squeegee is a squeegee mechanism configured to be rotatable with respect to a squeegee holding shaft in a direction orthogonal to a squeegee moving direction and to include a driving unit for rotating the squeegee.

According to a second aspect of the present invention, in the screen printing, a screen is arranged on a work substrate, and ink on the screen is passed through the screen by a squeegee to fill the work substrate. Is provided so as to be rotatable with respect to a squeegee holding shaft in a direction orthogonal to the squeegee moving direction, and a driving means for rotating the squeegee is provided, and further, the squeegee can be moved in the axial direction of the squeegee holding shaft. The squeegee mechanism is provided with a drive unit for moving the squeegee.

According to a third aspect of the present invention, in the screen printing wherein a screen is arranged on a work substrate and ink on the screen is passed through the screen with a squeegee to fill the work substrate, the squeegee includes:
A squeegee configured to be rotatable with respect to a squeegee holding shaft in a direction perpendicular to the squeegee moving direction to reciprocate the squeegee and to perform squeegee by tilting the squeegee forward in the traveling direction during the reciprocating operation. Is the way.

According to a fourth aspect of the present invention, in the screen printing wherein a screen is arranged on a work substrate and ink on the screen is passed through the screen with a squeegee to fill the work substrate, the squeegee includes:
A squeegee holding shaft is provided rotatably with respect to a squeegee holding shaft in a direction orthogonal to a squeegee moving direction, and is provided so as to be movable in an axial direction of the squeegee holding shaft. This is a squeegee method in which the squeegee is tilted forward in the direction to perform squeezing, and further, the position of the squeegee in the axial direction is made different between going and returning of the reciprocating operation.

In the present invention, the squeegee is provided rotatably with respect to the squeegee holding shaft in a direction orthogonal to the squeegee moving direction, and reciprocates the squeegee. Since the squeezing is performed by tilting forward, the squeegee inclination angle in the forward path or the return path can be individually and individually finely and finely adjusted according to various printing conditions such as a printing pattern and printing properties of ink. The printing quality can be improved.

Further, since the present invention is provided with a structure in which the axial position of the squeegee is made different between the going and returning directions of the reciprocating operation, the squeegee is moved in the printing moving direction in conjunction with the printing operation in the outward and returning directions. By moving the squeegee in the horizontal direction, high quality printing can be performed more reliably.

As described above, according to the present invention, even when a step existing on a substrate to be printed is relatively large, reliable and good screen printing can be performed.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete example according to the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the screen printing machine 1 of this embodiment is a substrate w which is held by a drive mechanism (not shown) on a base pedestal disposed on a floor (not shown) and is screen-printed. And a screen 5 on which a print pattern is formed, which is held above the mounting table 3 by a holding member 5a fixed to a base pedestal, and on which a printing pattern is formed. A frame member 6 surrounding the periphery, a reciprocating drive mechanism 8 provided on the frame member 6 for reciprocating a long plate-shaped rubber squeegee 7, and a predetermined printing inclination according to the moving direction. An inclination changing mechanism 9 for changing the inclination angle of the squeegee 7 to an angle, and a squeegee 7 during the movement according to the movement direction.
A vertical movement mechanism for lowering / upward within a predetermined range, a horizontal position changing mechanism 11 for changing the horizontal position of the squeegee in accordance with the moving direction, and an operation state of these mechanisms is determined, And a general control unit for automatically performing screen printing by performing a cooperative operation.

It is assumed that a predetermined circuit pattern or the like is formed in advance on the substrate w using a copper foil or the like. Also, at least a part of the circuit pattern made of the copper foil,
It is relatively thick, and it is assumed that a step portion larger than usual is formed on the printed surface on the substrate.

The ink i applied to the printing surface of the substrate w is obtained by dissolving a predetermined colored insulating synthetic resin such as green in a predetermined solution, and then drying and solidifying the resin. Then, the printed portion of the substrate w is colored, and the surface of the substrate w is protected. That is, the surface of the substrate w is protected in this way, and the insulation between the wirings of the circuit pattern is increased, so that the reliability of the circuit is improved.

Further, such an ink i is placed on the screen 5 in advance prior to the printing operation of the screen printing machine 1, and the amount of the ink depends on the thickness to be printed on the substrate. Is set.

Then, the ink i is uniformly applied between the circuit patterns formed using the copper foil on the substrate by the reciprocating screen printing of the screen printing machine 1,
I try to print.

The mounting table 3 on which the substrate w is mounted is
Using a thick steel material, the substrate w is formed in a substantially square shape having a larger area than the substrate w on which the substrate w is placed, and the rigidity is increased so that the substrate w can be placed stably. The mounting table 3 is held horizontally by a driving mechanism (not shown). The driving mechanism fixes the mounting table 3 at the printing position while maintaining the horizontal posture and supplies the substrate w. -It is configured to be able to move up and down and horizontally to the discharge position.

Further, the mounting table 3 is provided with a large number of small-diameter through holes 3a arranged at equal intervals so as not to extremely reduce the rigidity of the mounting table 3, and A light-emitting unit (not shown) is provided below, so that the substrate w to be placed can be easily positioned. That is, the substrate w can be positioned by mounting the substrate w so as to block light passing through these positioning through holes 3a in a predetermined manner.

The screen 5 arranged above the mounting table 3 has a plane shape formed in a substantially square shape having an area at least larger than the substrate w, as in the related art. The screen 5 is placed above the substrate w placed on the placement table 3 fixed at the printing position.
The substrate w is provided with a predetermined gap distance.
In correspondence with the circuit pattern of (1), the printed pattern is positioned in the horizontal direction so as to face the substrate w.

That is, the screen 5 is held by the holding member 5a such that the front end and the rear end in the printing movement direction can be easily replaced. Therefore, the squeegee 7 described later
During printing by the movement of the squeegee, the screen 5 is held not at the entire periphery but at the front end and the rear end in the printing movement direction.
So that you can contact them.

The holding member 5a at the rear end side with respect to the printing movement direction of the squeegee 7 is configured to rise in conjunction with the printing movement of the squeegee 7. Therefore, the corresponding portion of the screen 5 immediately after printing, which the squeegee 7 has passed, rises and separates from the substrate w.
The printing end surface is not stained.

Further, the screen 5 is made of a predetermined synthetic fiber material.
The ink i placed on the upper surface is penetrated in a predetermined manner, but has a property that it can be held so that it is not pushed out from the lower surface side unless pressed by the squeegee 7 or the like. The printing pattern formed on the screen 5 corresponds to the printing surface of the substrate w mounted on the mounting table 3, and the ink i of the substrate w
Are formed so as to easily pass the ink i.

Therefore, the ink i previously placed on the screen 5 is moved by the squeegee 7 which reciprocates while pressing the screen 5 in a predetermined manner as described later.
And passes over the substrate w.

Further, the frame member 6 is formed in a substantially square shape similar to the mounting table 3 in plan view, and is made of a steel material having high rigidity and surrounding the mounting table 3 and upward. It is constituted by a frame member, and its upper and lower surfaces are horizontally held and open.

Further, the frame frame member 6 is configured so that one end thereof along the printing movement direction is horizontally supported by the base pedestal, and the other end thereof can be pulled upward with this shaft as a center. The screen 5 located on the side can be easily replaced or checked.

The frame frame member 6 is provided with a reciprocating drive mechanism 8 provided with a base member 21 which is movably provided so as to be orthogonal to a printing movement direction to be described later. 8, the base member 2
1 is reciprocated in a predetermined manner. The base member 21 of the reciprocating mechanism is provided with a holding shaft horizontally along the longitudinal direction, and the squeegee holder 23 is rotatable and movable in the longitudinal direction on the holding shaft. The squeegee 7 is exchangeably mounted on the squeegee holder 23. Further, on the base member 21 side, an inclination changing mechanism 9 for changing the inclination angle of the squeegee holder 23, that is, the squeegee 7, and the squeegee 7 are moved down and
A vertical movement mechanism for raising is attached.

That is, the reciprocating drive mechanism 8 has the same structure as the conventional mechanism, and uses a motor or the like as a drive power source.
The base member 21, that is, the squeegee holder 23, the squeegee 7, the inclination changing mechanism 9, the vertical movement mechanism, and the horizontal position changing mechanism 11 mounted on the base member 21 are moved at a predetermined speed and a predetermined distance longer than the substrate w. , So that you can go straight back and forth.

The squeegee 7 is formed in a long plate shape having a predetermined thickness by using synthetic rubber having a predetermined elastic strength as a material. The elastic strength and thickness specific to each squeegee 7 are optimal for the printing conditions. That is, at the time of printing, the lower end side of the squeegee 7 abutting on the substrate w via the screen 5 is bent in a predetermined manner, and has an optimum end angle for pressing the ink i to penetrate the screen 5 and perform printing. like,
The squeegee 7 has been replaced and used.

The squeegee 7 is attached to a holding shaft via a squeegee holder 23. The squeegee holder 23 is formed in a substantially U-shape whose cross-sectional shape is opened downward, and the opening distance is set to be larger than at least the thickness of the base end of the squeegee 7.
A handle 23a for increasing or decreasing the opening distance is attached. That is, the handle 23a inserts the base end of the squeegee 7 into this opening, and
By rotating the opening 3a in a predetermined direction, the opening distance is reduced, the squeegee holder 23 firmly clamps and holds the squeegee 7, and replaces the squeegee 7 easily worn out or the squeegee 7 optimal for printing conditions. I can do it.

As shown in FIGS. 2 (3) and (4), the tilt changing mechanism 9 includes a base member 21 of the reciprocating drive mechanism 8.
The squeegee 7 is provided on the squeegee holder 23 so as to protrude in a direction orthogonal to the squeegee 7. Swing arm 2
6 is comprised.

That is, the longitudinal direction of the cylinder 25 is fixed to the base member 21 of the reciprocating drive mechanism 8, and the telescopic rod 25a of the cylinder 25 is directed downward.

The cylinder 25 is connected to an air compressor (not shown) via an air supply hose, and a predetermined air pressure is supplied from the air compressor. The supply of air into the cylinder 25 is switched by an electromagnetic valve provided in the middle of the air supply hose so that the telescopic rod 25a is extended and retracted. Further, an air pressure adjusting valve is provided in the middle of the air supply hose, and when the squeegee 7 is changed to a predetermined inclination angle as described later, the air pressure adjusting valve maintains the angle. The pressing biasing force can be adjusted.

The extension rod 25 of the cylinder 25
The tip of a is inserted into a through hole provided at the tip of the swing arm 26 of the squeegee holder 23, and a stopper piece is fixed to the penetrated tip.

Further, the swing arm 26 is formed in a rod shape having a predetermined length from a material having a predetermined rigidity, and the tip thereof is arranged along the printing direction and in the squeegee holder 23 mounted on the squeegee holder 23. 7 protrudes in a direction perpendicular to the vertical direction, and has a base end fixed to the squeegee holder 23.

Accordingly, the squeegee inclination angle at the time of forward printing and at the time of backward printing can be optimally set, and the pressing force for maintaining the squeegee 7 at this inclination angle can also be optimally set.

The inclination angle adjusting mechanism 30 for the squeegee 7
The inclination angle adjusting mechanism 30 allows the squeegee inclination angle at the time of forward printing and at the time of backward printing to be adjusted.
Each can be set individually and optimally.

That is, the tilt angle adjusting mechanism 30
An adjusting member 31 protruding from the both sides of the base member 21 of the reciprocating drive mechanism 8 in a substantially horizontal direction toward the printing direction and having an adjustable amount of the protrusion, and a squeegee holder 23 extending from the squeegee holder 23 in the printing direction. And a regulating member 32 provided to protrude substantially obliquely upward.

Therefore, as described above, the squeegee holder 23 and the squeegee 7 which are driven to swing in a predetermined direction by the rod drive of the cylinder 25 of the tilt change mechanism 9 are controlled by the regulating member 32. , And is stopped by the angle of inclination of the contacted state. At the same time, by adjusting the amount of protrusion of the adjusting member 31, the distance between the regulating member 32 and the adjusting member 31 until the contact thereof, that is, the inclination angle can be adjusted.

As a result, such an inclination angle adjusting mechanism 3
With 0, the squeegee inclination angle in the forward path or the return path can be individually and more finely and individually adjusted in accordance with various printing conditions such as the print pattern and the print properties of the ink i, and the print quality can be improved. Like that.
That is, for example, the squeegee inclination angles at the time of the forward path and the time of the return path can be adjusted to be different from each other.

Further, a horizontal position changing mechanism 11 for slightly moving the squeegee 7 in the horizontal direction with respect to the printing movement direction is provided in conjunction with the printing operation in the forward and backward directions, so that high quality printing can be performed more reliably. I can do it.

That is, as shown in FIGS. 2A and 2B, the horizontal position changing mechanism 11 applies the telescopic rod 35a to the base member 21 of the reciprocating drive mechanism 8 in a direction transverse to the printing movement direction. And a swing arm 36 having one end connected to the telescopic rod 35a and the other end connected to the squeegee holder 23.

The cylinder 35 is fixed to the base member 21 of the reciprocating drive mechanism 8 so that its longitudinal direction is transverse to the base member 21. The distal end of the telescopic rod 35 a of the cylinder 35 is connected to one end of the swing arm 36.

Further, the other end of the swing arm 36 is connected to the squeegee holder 23, and its substantially center is pivotally supported by a shaft 23 b fixed to the base member 21.

Therefore, as shown in FIG. 2A, when the cylinder 35 is retracted and its telescopic rod 35a is pulled into the cylinder 35, the other end of the swing arm 36 connected to the telescopic rod 35a. Moves about the axis to the left in the figure, and similarly, the squeegee holder 23 and the squeegee 7 move to the left. On the other hand, as shown in FIG.
a is projected from the cylinder 35, the telescopic rod 3
The other end of the swing arm 36 connected to 5a moves to the right in the figure around the axis, and similarly, the squeegee holder 23 and the squeegee 7 move to the right. The operation of changing the horizontal position of the squeegee 7 is performed in conjunction with the printing operation.

As a result, since the squeegee 7 which presses and applies the ink i is slightly deficient, the deficient part follows the same path even if the tip of the squeegee 7 for applying the ink i is slightly deficient. Squeegee 7
The printing surface can be reliably applied uniformly.

Further, although not shown, an up-down movement mechanism for moving the squeegee 7 up and down by a predetermined amount in the course of the movement is provided in conjunction with the printing movement operation.
The printing operation is performed by lowering the squeegee 7 to such an extent that the screen 5 reaches the substrate w, and avoids bringing the ink i to the end of the printing movement. The squeegee 7 is lowered to the screen 5 just before the remaining ink i, thereby enabling reciprocal printing.

That is, the vertical movement mechanism is provided with a squeegee 7
In the vicinity of the start of movement and the vicinity of the end of movement, the leading end below the squeegee 7 rises at least higher than the thickness of the ink i collected by the printing movement of the squeegee 7 in conjunction with the printing movement of the squeegee 7. I am trying to do it. The ascending position during the printing operation is at least a position that has passed through the substrate w located below the screen 5,
The descending position at which the subsequent return printing operation is started is not the same as the ascending position, and is set on the near side in the printing movement direction.

Therefore, when the squeegee 7 completes the printing movement in a certain direction, the ink i collected by the squeegee 7 is transferred not to the movement end end of the squeegee 7 but to the substrate w.
And when the squeegee 7 moves again in the opposite direction, the squeegee 7 comes into contact with the screen 5 at least in front of the remaining ink i. Make it printable.

Next, the printing operation of the screen printing machine 1 will be described.

An unprinted substrate w is positioned and mounted at a predetermined position on the mounting table 3 by a transfer means provided outside the screen printing machine 1, and the mounting table 3 is fixed at a predetermined printing position. Then, the screen printing machine 1 of this example
Reciprocal printing operation is started.

First, an outward printing operation is performed.

That is, as shown by a to g in FIG. 3A, the squeegee 7 is moved in the forward direction, and the forward printing is performed on the substrate w using the squeegee 7.

At the start of the outward movement, the inclination changing mechanism 9 described above sets the inclination angle to the forward inclination in the outward movement direction.
The inclination angle of the squeegee 7 is changed. At the same time, the horizontal position changing mechanism 11 changes the horizontal position orthogonal to the moving direction of the squeegee 7 to the horizontal position for the outward movement. Further, at least when the squeegee 7 reaches the position b during the forward movement, the tip of the squeegee 7 is lowered by the vertical movement mechanism through the screen 5 to such an extent that the squeegee 7 comes into contact with the substrate w with a predetermined pressing force.

Further, at least the squeegee 7 is
, The squeegee 7 rises. Therefore, when the squeegee 7 passes through the terminal end portion of the substrate w, it rises slightly and continues to move, so that the ink i is left near the substrate w.

Next, a return printing operation is performed.

That is, as shown by hn in FIG. 3 (2), the squeegee 7 is moved in the backward direction, and the backward printing is performed on the substrate w using the squeegee 7.

At the start of the backward movement, the inclination changing mechanism 9 described above sets the inclination angle to the forward inclination in the backward movement direction.
The inclination angle of the squeegee 7 is changed. At the same time, the lateral position change mechanism 11 changes the lateral position of the squeegee 7 to a lateral position different from the outward movement for the backward movement. Further, when the squeegee 7 reaches the position i at least during the backward movement, the tip of the squeegee 7 is lowered by the vertical movement mechanism through the screen 5 to such an extent that the squeegee 7 comes into contact with the substrate w with a predetermined pressing force.

Finally, the substrate w thus printed by reciprocating printing is discharged from the screen printing machine 1 with the movement of the mounting table 3 to the discharge / supply position, and is taken out by the transfer means. Is sent to the next step.
Then, the next unprinted substrate w is positioned and mounted on the mounting table 3 by the transfer means, and a similar reciprocating printing operation is repeated.

As described above, according to the squeegee mechanism and the squeegee method of the present embodiment, reliable and satisfactory screen printing can be performed even when the step existing on the substrate to be printed is relatively large.

[0083]

As described above, in the present invention,
The squeegee is provided rotatably with respect to the squeegee holding shaft in a direction orthogonal to the squeegee moving direction, and reciprocates the squeegee, and at the time of the reciprocating operation, tilts the squeegee forward in the traveling direction to perform squeezing. Therefore, according to various printing conditions such as a printing pattern and printing properties of ink, the squeegee inclination angle in the forward path or the backward path can be individually and individually finely and finely adjusted, thereby improving print quality. Can be.

Further, since the present invention has a structure in which the axial position of the squeegee is made different between the going and returning directions of the reciprocating operation, the squeegee moves in the printing movement direction in conjunction with the printing operation in the outward and returning directions. By moving the squeegee in the horizontal direction, high quality printing can be performed more reliably.

As described above, according to the present invention, reliable and good screen printing can be performed even when a step existing on a substrate to be printed is relatively large.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a screen printing machine according to a specific example of the present invention.

FIG. 2 shows a main part of a screen printing machine according to an embodiment of the present invention, wherein (1) and (2) are front views of a horizontal position changing mechanism, and (3) and (4) are inclination changing mechanisms. FIG.

FIG. 3 is a diagram showing a state in which a squeegee is moving with respect to a screen according to a specific example of the present invention.

FIG. 4 shows a part of a screen printing machine according to a conventional example,
(1) is a perspective view of a squeegee part, and (2) is a side view showing a squeegee, a screen, and a substrate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screen printing machine 3 Mounting table 3a Small through-hole for positioning 5 Screen 5a Screen holding member 6 Frame frame member 7 Squeegee 8 Reciprocating drive mechanism 9 Incline change mechanism 11 Lateral position change mechanism 21 Base member of reciprocal drive mechanism 23 Squeegee holder 23a Handle 23b Shaft 25 Cylinder 25a Cylinder telescopic rod 26 Swing arm 30 Inclination angle adjusting mechanism 31 Adjusting member 32 Restriction member 35 Cylinder 35a Telescopic rod 36 Swing arm 50 Screen printing machine 51 Mounting table 52 Screen 53 Scraper 54 Squeegee w board i ink

Claims (4)

[Claims] In screen printing, a screen is arranged on a work substrate, and ink on the screen is passed through the screen with a squeegee to fill the work substrate, wherein the squeegee is in a direction orthogonal to a squeegee moving direction. A squeegee mechanism provided rotatably with respect to the squeegee holding shaft and a driving means for rotating the squeegee. 2. A screen printing method in which a screen is arranged on a work substrate and ink on the screen is passed through the screen by a squeegee to fill the work substrate, wherein the squeegee is in a direction orthogonal to a squeegee moving direction. The squeegee holding shaft is provided rotatably with respect to the squeegee holding shaft, and a driving means for rotating the squeegee is provided. A squeegee mechanism comprising driving means. 3. A screen printing method in which a screen is arranged on a work substrate and ink on the screen is passed through the screen with a squeegee to fill the work substrate, wherein the squeegee is in a direction perpendicular to a squeegee moving direction. A squeegee method, wherein the squeegee is reciprocally provided with respect to a holding shaft, and at the time of the reciprocating operation, the squeegee is tilted forward in a traveling direction to perform squeegee. 4. In screen printing wherein a screen is arranged on a work substrate and ink on the screen is passed through the screen with a squeegee to fill the work substrate, the squeegee is in a direction orthogonal to a squeegee moving direction. The squeegee is provided so as to be rotatable with respect to the holding shaft, and is provided so as to be movable in the axial direction of the squeegee holding shaft, and performs the reciprocating operation of the squeegee. A squeegee method wherein the axial position of the squeegee is made different between going and returning in a reciprocating operation.